Frames.signature needs a full-text index in order to improve search performance for queries like the ones still causing timeouts in bug 444749. Need to: * determine if this is even feasible given the size of the result set and reports:frames cardinality (10:1) * if not, find a way to flatten frame data

Full-text may not be the best case since these aren't dictionary words, but we're reading up on the best solution for optimizing this search.

reports.signature is what people are most likely to be interested in, so we should make that really fast. frames.signature is interesting to some people, so it'd be nice if it was possible to query against that, but you can probably restrict to exact matches if it makes life easier.

We will get full text indexing on signatures from ES (bug 651279).